Banca de DEFESA: LARISSA GONCALVES RIBEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LARISSA GONCALVES RIBEIRO
DATA : 24/03/2023
HORA: 14:00
LOCAL: https://meet.google.com/qwb-pmyg-hpv
TÍTULO:

Incorporation of TiO2 in the structure of KIT-5 and KIT-6 through the in situ anchoring method (ISA) to imply the photodegradation of the Rodamine-B dye.

PALAVRAS-CHAVES:

Nanomaterials; Titanium dioxide; In situ anchoring; Dye; Heterogeneous photocatalysis.

PÁGINAS: 100
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The rapid industrialization in recent years has been the subject of questions among environmentalists and researchers in the area, since many of these industries have caused complications to the environment. Among these industries, there is the textile, which during the dyeing of fabrics ends up releasing effluents rich in organic compounds, including dyes, which are highly dangerous when discarded directly into nature. An alternative to eliminate these pollutants from these waters is through heterogeneous photocatalysis, in which TiO2 stands out due to a series of properties, but this compound has some limitations, which are its particle size and its application in aqueous media, which when added to a mesoporous support they are reduced. Thus, this work aimed to produce the mesoporous materials KIT-5 and KIT-6 incorporated with a colloidal solution of TiO2 through a new synthesis method, in situ anchoring (ISA), to then be used in the photodegradation of the dye Rhodamine B, present in textile industry effluents. The synthesis of TiO2-modified KIT-5 and KIT-6 was performed using the ISA method at three different silicon/titanium ratios. Soon after, DRX characterizations were performed, in which materials with the expected structure were obtained. FRX was performed, which showed that among the samples the one that came closest to the theoretical molar ratio of Si/Ti was the ratio 25 for both synthesized materials. The TG/DTG/DSC thermal analysis showed that the materials presented good thermal stability. The SEM images showed that the material obtained the expected morphology, and through the EDS images it was possible to observe the good distribution of titanium nanocrystals in the structure of the material. On the other hand, the photocatalytic tests showed that the KIT-5/TiO2 (25) and KIT-6/TiO2 (25) catalysts were the ones that presented the highest percentage of degradation of the dye Rhodamine B, as well as showed good reuse capacity in new catalytic cycles. In view of this, it can be stated that the new synthesis method adopted, the anchoring in situ (ISA), was efficient, since the material was successfully obtained and presented optimistic results in relation to photodegradation of the dye.

MEMBROS DA BANCA:
Externa à Instituição - ADRIANA PAULA BATISTA DOS SANTOS - UERN
Presidente - 7961 - ANNE GABRIELLA DIAS SANTOS CALDEIRA
Externa à Instituição - SIBELE BERENICE CASTELLA PERGHER - UFRN